Electro magnets

i need to know how to make an electro magnet i can plug into my wall outlet. it is for a project i'm working on and a need a constent flow i can turn on and off. it only needs to lift under one pound. also will a electro magnet work with a north and south like a regular magnets or will it just pull both north and south. thank you
 
AC voltage would not be good for this because the current and voltage is very inconsistant... I would use a Voltage Regulator to keep it fairly constant... an electromagnet does have polar charges... see this article for more on the electromagnets:

http://www.tpub.com/content/armyordnance/OD1647/OD16470126.htm

^_^
 

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